Biological extrusion screw and method for making same

Abstract

The present invention relates to medical article, and is especially one kind of orthopaedic internal fixer and its making process. The orthopaedic internal fixer is one threaded cylinder with conic front end, two radial slots in the edge of its back end, central axial through hole and inner thread in the back end of the through hole. It may be installed and detached with a special tool easily, and its screw may be machined according to the method of patent No. 200510031414.1. It is made with the bone of ox, horse, sheep, pig or other animal as material and through the steps of taking bone, machining, defatting, cleaning, packing and sterilizing. It can fuse with human body's bone skeleton and may be degraded slowly.

Description

technical field [0001] The invention relates to a medical product and a manufacturing method thereof, in particular to an orthopedic internal fixation device and a manufacturing method thereof. Background technique [0002] At present, orthopedic surgery usually requires the use of internal fixators for fixation. Screws are commonly used internal fixators, such as the fixation method for the treatment of rupture and damage of tendons and ligaments near joints. Usually, tunnels are dug on bones for installation of tendons and ligaments. The ends of the tendons and ligaments are forced to be squeezed around the inner wall of the tunnel with extrusion screws. The screws must be able to fuse with human bone tissue and degrade slowly without adverse side effects. The structure of the extruded screw is generally a cylindrical threaded body with a conical front end, a through hole in the center, and a radial through groove or an inner square groove on the rear end surface, which is...

AI Technical Summary

Problems solved by technology

The extruded screw has the following disadvantages and disadvantages in terms of materials: although the extruded screw made of metal material has high mechanical strength and fatigue resistance, it can meet the needs of orthopedic surgery for fixation, but there are implant erosion, The possibility of complications such as metal allergy and tumor-causing implant materials, especially in terms of biomechanics, because the elastic modulus difference between metal materials and human bones is too large, the stress shielding effect is too strong, and cortical bone atrophy under the metal materials is prone to occur and loose change, leading to treatment failure

Extrusion screws made of high molecular polymers can be absorbed by the human body, but due to the rapid degradation and absorption time, tendons and ligaments will fall off again, resulting in treatment failure. sex cyst

Screws made of allogeneic bone have good biocompatibility and can be absorbed by the human body without secondary surgery to remove them, but the bone source is difficult and may cause human disease transmission

The heterogeneous cortical bone screw has the advantages of the allogeneic bone screw, and the bone source is abundant, so the prospect of popularization and application is broad. Chinese patent 200510031414.1 discloses a "manufacturing method of heterogeneous bone internal fixator", but it does not disclose that it can meet the above internal fixation requirements. The structure of the required extrusion screw and its specific manufacturing method

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